is it fuel related?

vw754

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AUDI A4 TDI B6 2001.

starts late,when i turn the key it takes around 4 seconds approx to start,it use to start as soon as i used to turn the key (1 second)

It's as if there is no fuel,and i always keep a full tank,use to do it now and then,but now it does it eveytime i start it.

cant be glow plugs (does it if engines hot) i can switch off engine for 3 seconds,re-start and same problem. Anything do with any relay or ??.

Cant see no visible fuel leaks (although it does seem slightly heavy on fuel)

NO FAULTS FOUND VIA VAG-COM

SOMEONE PLEASE GIVE ME SOME IDEAS:keule:
 

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